The most important publisher, AKA "CRC Jianian". TODO meaning of Jianian?
Chinese government owned unfortunately.
Their website takes forever to load: www.china-crc.com.cn/, and features mostly Communist shit, and I can't find the decent traditional music listed there.
One thing to try is an Amazon advanced search by label "China Record Co": www.amazon.com/s?i=digital-music&rh=p_33%3AChina+Record+Co&s=relevancerank&Adv-Srch-MP3-Submit.x=42&Adv-Srch-MP3-Submit.y=4&unfiltered=1&ref=sr_adv_m_digital
Why was this so rarely used as of 2020s compared to ISBNs? It would have been perfect for helping find obscure records from Chinese traditional music and Indian classical music!
But instead we have Discogs, which is not too bad.